(-0.3)×(-5)×(-0.4)×(-0.8)×(-1)²

To calculate the expression \((-0.3) \times (-5) \times (-0.4) \times (-0.8) \times (-1)^2\), we need to first simplify the multiplication of all the numbers:

\((-0.3) \times (-5) \times (-0.4) \times (-0.8) \times (-1)^2 = 0.3 \times 5 \times 0.4 \times 0.8 \times 1^2\)

Now, multiplying these numbers together:

\(0.3 \times 5 \times 0.4 \times 0.8 \times 1^2 = 0.3 \times 5 \times 0.4 \times 0.8 = 0.3 \times 2 = 0.6\)

So, \((-0.3) \times (-5) \times (-0.4) \times (-0.8) \times (-1)^2 = 0.6\)